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data["invoice_no"] = invoice_no.group(0) if invoice_no else None data["total"] = total.group(1) if total else None python nang cao pdf
While beginners learn classes and inheritance, advanced practitioners favor . Python’s protocols (informal interfaces) enable "duck typing" without rigid hierarchies. For instance, implementing __len__ and __getitem__ makes a custom class behave like a sequence, compatible with len() and slicing. python nang cao pdf
for page in reader.pages: writer.add_page(page) python nang cao pdf